fs/ext4/inode-test.c

File Facts

System

Linux kernel

Corpus path

fs/ext4/inode-test.c

Extension

.c

Size

7745 bytes

Lines

284

Domain

Core OS

Bucket

VFS And Filesystem Core

Inferred role

Core OS: implementation source

Status

source implementation candidate

Why This File Exists

Core operating-system implementation surface: boot, tasks, memory, VFS, syscall-facing interfaces, synchronization, credentials, and isolation.

• Core operating-system implementation surface: boot, tasks, memory, VFS, syscall-facing interfaces, synchronization, credentials, and isolation.
• Defines or uses C structs; map object ownership, embedded links, reference counts, and lock ownership.

Dependency Surface

• kunit/test.h
• linux/kernel.h
• linux/time64.h
• ext4.h

Detected Declarations

• struct timestamp_expectation
• function timestamp_expectation_to_desc
• function get_32bit_time
• function inode_test_xtimestamp_decoding

Annotated Snippet

struct timestamp_expectation {
	const char *test_case_name;
	struct timespec64 expected;
	u32 extra_bits;
	bool msb_set;
	bool lower_bound;
};

static const struct timestamp_expectation test_data[] = {
	{
		.test_case_name = LOWER_BOUND_NEG_NO_EXTRA_BITS_CASE,
		.msb_set = true,
		.lower_bound = true,
		.extra_bits = 0,
		.expected = {.tv_sec = -0x80000000LL, .tv_nsec = 0L},
	},

	{
		.test_case_name = UPPER_BOUND_NEG_NO_EXTRA_BITS_CASE,
		.msb_set = true,
		.lower_bound = false,
		.extra_bits = 0,
		.expected = {.tv_sec = -1LL, .tv_nsec = 0L},
	},

	{
		.test_case_name = LOWER_BOUND_NONNEG_NO_EXTRA_BITS_CASE,
		.msb_set = false,
		.lower_bound = true,
		.extra_bits = 0,
		.expected = {0LL, 0L},
	},

	{
		.test_case_name = UPPER_BOUND_NONNEG_NO_EXTRA_BITS_CASE,
		.msb_set = false,
		.lower_bound = false,
		.extra_bits = 0,
		.expected = {.tv_sec = 0x7fffffffLL, .tv_nsec = 0L},
	},

	{
		.test_case_name = LOWER_BOUND_NEG_LO_1_CASE,
		.msb_set = true,
		.lower_bound = true,
		.extra_bits = 1,
		.expected = {.tv_sec = 0x80000000LL, .tv_nsec = 0L},
	},

	{
		.test_case_name = UPPER_BOUND_NEG_LO_1_CASE,
		.msb_set = true,
		.lower_bound = false,
		.extra_bits = 1,
		.expected = {.tv_sec = 0xffffffffLL, .tv_nsec = 0L},
	},

	{
		.test_case_name = LOWER_BOUND_NONNEG_LO_1_CASE,
		.msb_set = false,
		.lower_bound = true,
		.extra_bits = 1,
		.expected = {.tv_sec = 0x100000000LL, .tv_nsec = 0L},
	},

	{
		.test_case_name = UPPER_BOUND_NONNEG_LO_1_CASE,
		.msb_set = false,
		.lower_bound = false,
		.extra_bits = 1,
		.expected = {.tv_sec = 0x17fffffffLL, .tv_nsec = 0L},
	},

	{
		.test_case_name = LOWER_BOUND_NEG_HI_1_CASE,
		.msb_set = true,
		.lower_bound = true,
		.extra_bits =  2,
		.expected = {.tv_sec = 0x180000000LL, .tv_nsec = 0L},
	},

	{
		.test_case_name = UPPER_BOUND_NEG_HI_1_CASE,
		.msb_set = true,
		.lower_bound = false,
		.extra_bits = 2,
		.expected = {.tv_sec = 0x1ffffffffLL, .tv_nsec = 0L},
	},

	{

Annotation

• Immediate include surface: `kunit/test.h`, `linux/kernel.h`, `linux/time64.h`, `ext4.h`.
• Detected declarations: `struct timestamp_expectation`, `function timestamp_expectation_to_desc`, `function get_32bit_time`, `function inode_test_xtimestamp_decoding`.
• Atlas domain: Core OS / VFS And Filesystem Core.
• Implementation status: source implementation candidate.

Implementation Notes

• This generated page is the file-by-file coverage layer; curated subsystem chapters should link here when they synthesize a multi-file control flow.
• Core OS pages should be promoted from atlas-only to deep-reviewed when they explain data structures, invariants, locking, lifecycle, and C implementation snippets.
• Driver-family pages are intentionally pattern-oriented unless they are part of the selected PCIe/NVMe representative device path.